This article is part 1 of a series about building a high-performance web cluster powerful enough to handle 3 million requests per second. This first article describes my limited experience with a few load generator tools, and will hopefully save someone the time of having to stumble through each one like I did. Load generators [...]
How to check and stop if DDoS attack is going on
Distributed denial-of-service attacks In a distributed attack, the attacking computers are often personal computers with broadband connections to the Internet that have been compromised by viruses or Trojan horse programs. These allow the perpetrator to remotely control machines to direct the attack, and such an array of computers is called a botnet. With enough such [...]
How to Server Security Considerations
>Server security is as important as network security because servers often hold a great deal of an organization’s vital information. If a server is compromised, all of its contents may become available for the cracker to steal or manipulate at will. The following sections detail some of the main issues. CLASS=”SECT2″ > CLASS=”SECT2″ > NAME=”S2-RISK-SERV-PORTS” >2.3.1. Unused Services [...]
How to handle server is under a DDOS attack!
Ok first just take a breath, you are getting nothing done by worrying. This guide is meant to try and help mitigate the effects of an attack that is in progresss. I have compiled a lot of the things that I do but it is very possible I have forgotten something. Please feel free to [...]
How to Deal With Distributed Denial of Service Attacks
Distributed denial of service attacks are frustrating — they’re frustrating for the company under attack, and frustrating for the web host. They can also be costly in terms of business and goodwill lost. Fortunately, there are ways to deal with them, if you are willing to prepare for the possibility of a DDoS before it happens. [...]
How to Connect Hotmail Messenger with Facebook
Tired of signing in to Facebook and Hotmail Messenger? Connecting a social networking site like Facebook with your Hotmail Messenger is actually an easy way to get connected with all the contacts at one place. Whether you are signed in to Facebook or Hotmail, you will be able to see all the news feed at [...]
Linux Server Hardening Security Tips
Securing your Linux server is important to protect your data, intellectual property, and time, from the hands of crackers (hackers). The system administrator is responsible for security Linux box. In this first part of a Linux server security series, I will provide 20 hardening tips for default installation of Linux system. #1: Encrypt Data Communication [...]
How to: Purge, Flush or Delete Postfix Queue, or a Single Email
To flush or purge the postfix mail queue, just enter this command [root@web ~]#postfix -f But if you need to delete an individual email from the queue, you’ll first need to see the queue. Traditionally you use mailq this time we’ll use: [root@web ~]#postqueue -p And the output should show all messages in queue: 5642B4D8647* 1683500 Tue [...]
Monitoring Bandwidth with VNstat
VNstat is a bandwidth monitoring tool that will let you monitor your bandwidth and provide daily, weekly and monthly tracking metrics. To install and setup Vnstat, you will need to follow the steps in this article. Log into your linux server and type the following command.wget http://humdi.net/vnstat/vnstat-1.10.tar.gz Next to uncompress the file you will need [...]
Customize and Disable ‘Export’ Menu on PHPmyAdmin
In my development environment, we have 2 levels of PHPmyAdmin user, the superuser (root) and developer user. Superuser is able to access all features available in PHPmyAdmin and developer user is the database user for database planet_shop which have limitation as stated in MySQL user privilege table. The current problem is that developer user, which use PHPmyAdmin [...]
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